Question about Toshiba 43H70 43" Rear Projection Television

1 Answer

Convergence without a remote control

Hi. I am trying to fix a friends Toshiba 43H70 that has severe convergence problems. Without any input, just looking at the menu, the text is written three times (red, green blue) and is bowing severely. S-video and composite from a dvd player also have this problem.

I replaced the STK392-110's with STK392-180's and I checked the big power resistors for opens but they measured ok. Now when I power the TV on, The convergence still looks pretty bad but at least it does not shut down after 3 minutes like before I replaced the chips.

My question is how bad does the convergence look after you change the IC's but before you make any calibration? My friend can not find the remote, and I can not figure out how to get into the convergence menu with just the front panel of the TV. Do I need the factory remote? Could I use a universal remote if I had the right code?

Thanks for any advice. This is a great board.

Posted by on

  • 4 more comments 
  • Georget Mar 30, 2008

    Wow That was fast! Thank you so much for that info. I will have him tear his house apart to find it, but it's good to know about I will post my results after I have a factory remote.

    Thank you again Slinteriors


  • Georget Apr 02, 2008

    I still do not have a factory remote, but I was able to get into the
    service menu with a universal remote. When I ran the Self Diagnostic,
    the power section which should read "Power :000"

    instead reads "Power :003" (see photo). In the service manual it calls
    this the Operation Number of Protection Circuit (current limiter). I'm
    not sure how to interpret this.

    Then I went into the Convergence Adjustment menu to display a cross
    hatch pattern (see photo). As you can see in the photo it looks pretty
    bad. I am able to move the Red, Green and Blue color lines both
    horizontally and vertically. Of course I only moved the lines enough to
    see that I can move them. I put them back to their original location
    when I was done, and I did not save anything.

    Hopefully someone will see the pictures I posted and will have an idea on this problem.



  • Georget Apr 02, 2008

    This is the user menu

  • Georget Apr 03, 2008

    Slinteriors, Once again, thanks for your help. I measured the + & - voltage going to the convergence amps on pins 4 and 5.
    On pin 4 the schematic shows -15.9v and I read -14.6v
    On pin 5 the schematic shows +15.8v and I read +16.07.

    That -14.6v does not sound good. The + & - 15v are coming from the same bridge rectifier on the power supply board. I will do some investigating.

    I will also pull the 1.2 ohm power resistors from the convergence circuit and measure them for the correct tolerance.

    I will report back tomorrow.

    Thanks again

  • Georget Apr 04, 2008

    I pulled all 6 power resistors out of the circuit and measured them with my low ohms meter. All resistors measured the same weather in the circuit or out. Unfortunately my low ohms meter is reading EVERYTHING low right now, but at least I see a consistent reading on all the resistors. I doubt they are all bad.

    I still need to track down this voltage drop on the -15.9v circuit. At the source from the bridge rectifier I am getting the +16.55v & -16.04v but by the time it ends up at the convergence IC's it drops to +16.07v & -14.50v

  • Georget Apr 09, 2008

    Still no luck with this bad boy. I pulled the bridge rectifier out and checked it with my digital meter. It uses +5v for the diode test. Bridge looks good. No opens or shorts, and the four diodes inside read the same bias. There are two 3300mf caps on the plus and minus side of the bridge. Maybe one of them is leaking. I will swap them and see what happens.

    I hope I'm not chasing a wild goose here. It would make sense that both the positive and negative voltages going to the convergence IC's should be pretty close, not off by 1.5v

    Would it hurt the convergence IC's if I removed the positive and negative voltages going to them, then power up the set to take readings?



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  • 8,617 Answers

You will need the origional remote you can get one fast through this link just enter the model number
its normal after an IC change for the convergence to need adjusting, universal remotes can sometimes do it, but i have only seen that happen once or twice usually they wont have the right feature to adjust then save the settings.

Posted on Mar 30, 2008

  • 2 more comments 
  • Sonny Berry
    Sonny Berry Mar 30, 2008

    youre welcome good luck

  • Sonny Berry
    Sonny Berry Apr 02, 2008

    youre getting too much current to the convergence circuit. I would suspect the regulator for the convergence power supply. Did you check the convergence resistors out of circuit, as they can only be out of tolerance by 5 % any more can cause this type of severe convergence and also allow the current to rise.

  • Sonny Berry
    Sonny Berry Apr 04, 2008

    you may have a leaky diode in that circuit.

  • Sonny Berry
    Sonny Berry Apr 09, 2008

    know it wont affect the ICs



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